<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="obj in list" :key="obj.id">
            <td>{{obj.id}}</td>
            <td>{{obj.name}}</td>
           
            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{red:obj.price>100}">{{obj.price}}</td>
            <td>{{obj.time | time}}</td>
            <td><a href="#" @click="del(obj.id)" >删除</a></td>
          </tr>
          <tr style="background-color: #EEE" v-show="list.length!==0">
     <td>统计:</td>
     <td colspan="2">总价钱为: {{ allPrice }}</td>
     <td colspan="2">平均价: {{ svgPrice }}</td>
</tr>
        </tbody>
          
        <tfoot v-show="list.length===0">
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
           
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="资产名称"
              v-model="name"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="价格"
              v-model.number="price"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="addFn">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
import moment from "moment";
// import xxx from './xxx'
// import { json } from "stream/consumers";
export default {
  computed: {
    allPrice() {
      return this.list.reduce((sum, obj) => (sum += obj.price), 0);
    },
    svgPrice() {
      return (this.allPrice / this.list.length).toFixed(2);
    }
  },
  data() {
    return {
      name: "", // 名称
      price: 0, // 价格
      list: JSON.parse(localStorage.getItem("pList")) || []
      //   list: [
      //     { id: 100, name: "外套", price: 199, time: new Date("2010-08-12") },
      //     { id: 101, name: "裤子", price: 34, time: new Date("2013-09-01") },
      //     { id: 102, name: "鞋", price: 25.4, time: new Date("2018-11-22") },
      //     { id: 103, name: "头发", price: 19900, time: new Date("2020-12-12") }
      //   ]
    };
  },
  watch: {
    list: {
      handler() {
        localStorage.setItem("pList", JSON.stringify(this.list));
      },
      deep: true
    }
  },
  filters: {
    time(val) {
      return moment(val).format("YYYY-MM-DD");
    }
  },
  methods: {
    addFn() {
      if (this.name.trim().length == 0 || this.price.length === 0) {
        alert("**你个**，给劳资输入数据");
        return;
      }

      //   let id =
      //     this.list.length > 0 ? this.list[this.list.length - 1].id + 1 : 100;

      this.list.push({
        id: this.list[this.list.length - 1].id + 1,
        name: this.name,
        price: this.price,
        time: new Date()
      });
    },
    del(id) {
      let index = this.list.findIndex(obj => obj.id === id);
      this.list.splice(index, 1);
    }
  }
};
</script>

<style >
.red {
  color: red;
}
</style>